US5420596A - Quarter-wave gap-coupled tunable strip antenna - Google Patents
Quarter-wave gap-coupled tunable strip antenna Download PDFInfo
- Publication number
- US5420596A US5420596A US08/157,250 US15725093A US5420596A US 5420596 A US5420596 A US 5420596A US 15725093 A US15725093 A US 15725093A US 5420596 A US5420596 A US 5420596A
- Authority
- US
- United States
- Prior art keywords
- antenna
- strip
- resonant
- parasitic
- driven
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Expired - Lifetime
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Classifications
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01Q—ANTENNAS, i.e. RADIO AERIALS
- H01Q19/00—Combinations of primary active antenna elements and units with secondary devices, e.g. with quasi-optical devices, for giving the antenna a desired directional characteristic
- H01Q19/005—Patch antenna using one or more coplanar parasitic elements
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01Q—ANTENNAS, i.e. RADIO AERIALS
- H01Q1/00—Details of, or arrangements associated with, antennas
- H01Q1/12—Supports; Mounting means
- H01Q1/22—Supports; Mounting means by structural association with other equipment or articles
- H01Q1/24—Supports; Mounting means by structural association with other equipment or articles with receiving set
- H01Q1/241—Supports; Mounting means by structural association with other equipment or articles with receiving set used in mobile communications, e.g. GSM
- H01Q1/242—Supports; Mounting means by structural association with other equipment or articles with receiving set used in mobile communications, e.g. GSM specially adapted for hand-held use
- H01Q1/243—Supports; Mounting means by structural association with other equipment or articles with receiving set used in mobile communications, e.g. GSM specially adapted for hand-held use with built-in antennas
Definitions
- This invention relates generally to antennas for receiving and transmitting UHF radio frequency signals ranging between 800 MHz and 3,000 MHz, and more particularly to such antennas for use in miniature portable devices.
- a miniature radio device has an antenna which comprises a driven resonant strip and a parasitically excited strip.
- FIG. 1 shows a top view of an antenna in accordance with the preferred embodiment of the invention.
- FIG. 2 shows a side view of the antenna in accordance with the preferred embodiment of the invention.
- FIG. 3 shows a Smith chart representation of the input impedance resulting from experimental characterization of the antenna of the preferred embodiment.
- FIG. 4 shows a plot of the standing wave ratio (SWR) resulting from experimental characterization of the antenna of the preferred embodiment.
- FIG. 5 shows a top view of an alternate embodiment of the present invention.
- FIG. 6 shows a cross sectional view of the alternate embodiment of FIG. 5.
- FIG. 1 shows a top view of an antenna in accordance with the preferred embodiment of the invention.
- the antenna comprises a driven resonant strip, 10, a first parasitically excited strip, 12, and a second parasitically excited strip 14.
- Parasitically excited strips, 12 and 14 are separated from the resonant strip, 10, by a predetermined distance 16.
- the strips 10, 12 and 14 are affixed to a first surface of a low loss dielectric substrate 18.
- FIG. 1 also shows three trim tabs, 20, 22 and 24, for adjusting a resonant frequency of each strip of the antenna, wherein a first of the three trim tabs, 20, is attached the resonant strip, 10, a second of said three trim tabs, 22, is attached to the first parasitically excited strip, 12, and a third of the three trim tabs, 24, is attached to the second parasitically excited strip, 14.
- a feed, 30, is coupled at a first end to the resonant strip, 10, and is for coupling the antenna to an electronic radio frequency device such as an ack-back pager.
- An ack-back pager is capable of receive and transmit functions and has both receiver and transmitter circuits.
- a multiplicity of ground posts, 33 electrically ground one end of the strips, 10, 12 and 14.
- the feed, 30 is, located a predetermined distance, 35, from its nearest ground post, 33.
- seven ground posts, 33 are attached to the resonant strip, 10, three of ground posts, 33, are attached to the first parasitically excited strip, 12, and three ground posts, 33, are attached to the second parasitically excited strip, 14.
- only one ground post 33 per strip may be used.
- FIG. 2 shows a side view of the antenna in accordance with the preferred embodiment of the invention.
- a ground plane, 40 is affixed to the second side of the substrate, 18.
- a RF connector, 50 for interfacing the antenna with a radio receiver circuit such as a receive only selective call receiver paging circuit or an ack-back transceiving paging circuit, 60.
- the circuit, 60 may be affixed to the ground plane, 40.
- the ground plane, 40 being substantially parallel and in close proximity to the strips, provides both a ground reference for the antenna strips 10, 12 and 14, and a radio frequency shield to prevent undesirable interference between the antenna and the circuit 60.
- the second end of each ground post, 33 is attached to the ground plane, 40.
- the substrate, 18, has a length of substantially 84.8 mm, a width of substantially 55.9 mm and a thickness of substantially 3.2 mm and consists of a dielectric material such as FR4 (a flame retardant classification) or other glass/epoxy material.
- the resonator strip, 10, has a length of substantially 35.6 mm, a width of substantially 45.0 mm, with the trim tab, 20, having a length of substantially 1.3 mm, a width of substantially 7.6 mm.
- the first parasitically excited strip, 12, has a length of substantially 40.8 mm, and a width of substantially 12.7 mm, with the respective trim tab, 22, having a length of substantially 1.3 mm, and a width of substantially 7.6 mm.
- the second parasitically excited strip, 14, has a length of substantially 39.5 mm, and a width of substantially 12.7 mm, with the respective trim tab, 24, having a length of substantially 1.3 mm, and a width of substantially 7.6 mm.
- the strips, 10, 12 and 14, and the trim tabs, 20, 22 and 24 consisting substantially of copper.
- the strips, 10, 12 and 14, are centered about a common axis relative to each other.
- the distance, 16, between the strips is substantially 0.10 mm.
- the distance, 35, between the feed and its nearest ground post is substantially 17.8 mm.
- the ground posts are located substantially 2.4 mm from an edge of a strip and have a diameter of substantially 2.3 mm.
- the feed, 30, and resonator strip, 10, are centered about a common axis perpendicular to the ground posts, 33.
- FIG. 3 shows a Smith chart representation of the input impedance resulting from experimental characterization of the antenna of the preferred embodiment.
- the Smith chart shows that the reflection coefficient does not exceed 0.33 over the frequency range between substantially 896 MHz and 956 MHz.
- FIG. 4 shows a plot of the standing voltage wave ratio (SWR) resulting from experimental characterization of the antenna of the preferred embodiment.
- SWR standing voltage wave ratio
- the overall dimensions of the antenna 84.8 mm ⁇ 55.9 mm ⁇ substantially 3.2 mm, make the antenna suitable for a miniature paging receiver implemented in a common credit card sized form factor.
- the driven resonant strip, 10, has a quarter-wave resonant length at the center frequency of operation, which is preferably 916 MHz.
- the distance, 35, between the feed, 30, and its nearest ground post, 33, is set to provide a match to a nominally fifty ohm impedance with a standing wave ratio of 2:1 or less across the operating band.
- the two parasitically excited strips, 12 and 14, have quarter wave resonant lengths at the upper and lower frequencies of operation, which are preferably 901 and 930 MHz.
- the distances between the strips, 16, are set to cause capacitive coupling between the strips thereby producing the desired impedance bandwidth of the antenna.
- the trim tabs, 20, 22 and 24, allow the resonant frequency of each strip, 10, 12 and 14, to be individually adjusted by removing metalization from the respective strip.
- the antenna provides for constructing a miniature pager useful in new paging systems operating in the radio frequency range between substantially 800 MHz and 3000 MHz.
- the antenna has a bandwidth of about 6.5% of the receive frequency. This provides for frequency hopping in the 902 to 928 MHz band, and the antenna can both transmit in the 901 to 902 MHz band and receive in the 929 to 932 or 940 to 941 MHz paging channels.
- the dimensions of the antenna of FIG. 1 may be scaled in proportion to provide operation at other frequencies, including the frequencies in the 800 MHz to 3,000 MHz range.
- an antenna for use in a miniature paging device which has a bandwidth which is wider than the bandwidth provided by conventional miniature antenna structures.
- FIG. 5 shows a top view of an alternate embodiment of the present invention.
- FIG. 6 shows a cross sectional view of the embodiment of FIG. 5.
- the bandwidth is determined by the resonant frequency of the two strips 110 and 112. Since ground posts 133 are in the middle of each strip, the strips are half wave resonant rather than quarter wave resonant as shown in the antenna of FIG. 1.
- Feed 130 is placed similar to the method of placing feed 30 to obtain a desired impedance match to the antenna.
- Substrate 118 and ground plane 140 perform similar functions to 18 and 40 respectively.
- a paging receiver or transceiver circuit may be attached to ground plane 140. It should be appreciated that similar half wave resonant lengths could be implemented with strips 10, 12, and 14 of FIG. 1.
- Insulator substrate 150 and plate 160 form an alternate means for coupling strip 110 to strip 120.
- plate 160 directly couples strip 120 to strip 110. This results in a substantially improved electrical coupling mechanism between the strips. It should be appreciated that similar coupling could be implemented between strips 10, 12, and 14 of FIG. 1.
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- Engineering & Computer Science (AREA)
- Computer Networks & Wireless Communication (AREA)
- Support Of Aerials (AREA)
- Mobile Radio Communication Systems (AREA)
- Details Of Aerials (AREA)
Abstract
Description
Claims (17)
Priority Applications (3)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
US08/157,250 US5420596A (en) | 1993-11-26 | 1993-11-26 | Quarter-wave gap-coupled tunable strip antenna |
EP94117751A EP0655797B1 (en) | 1993-11-26 | 1994-11-10 | Quarter-wave gap-coupled tunable strip antenna |
DE69411355T DE69411355T2 (en) | 1993-11-26 | 1994-11-10 | Tunable stripline antenna with a quarter wavelength gap coupling |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
US08/157,250 US5420596A (en) | 1993-11-26 | 1993-11-26 | Quarter-wave gap-coupled tunable strip antenna |
Publications (1)
Publication Number | Publication Date |
---|---|
US5420596A true US5420596A (en) | 1995-05-30 |
Family
ID=22562948
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
US08/157,250 Expired - Lifetime US5420596A (en) | 1993-11-26 | 1993-11-26 | Quarter-wave gap-coupled tunable strip antenna |
Country Status (3)
Country | Link |
---|---|
US (1) | US5420596A (en) |
EP (1) | EP0655797B1 (en) |
DE (1) | DE69411355T2 (en) |
Cited By (51)
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US5627550A (en) * | 1995-06-15 | 1997-05-06 | Nokia Mobile Phones Ltd. | Wideband double C-patch antenna including gap-coupled parasitic elements |
US5657028A (en) * | 1995-03-31 | 1997-08-12 | Nokia Moblie Phones Ltd. | Small double C-patch antenna contained in a standard PC card |
US5680144A (en) * | 1996-03-13 | 1997-10-21 | Nokia Mobile Phones Limited | Wideband, stacked double C-patch antenna having gap-coupled parasitic elements |
US5703600A (en) * | 1996-05-08 | 1997-12-30 | Motorola, Inc. | Microstrip antenna with a parasitically coupled ground plane |
DE19720773A1 (en) * | 1996-06-03 | 1998-02-05 | Mitsubishi Electric Corp | Antenna device |
US5777581A (en) * | 1995-12-07 | 1998-07-07 | Atlantic Aerospace Electronics Corporation | Tunable microstrip patch antennas |
US5781158A (en) * | 1995-04-25 | 1998-07-14 | Young Hoek Ko | Electric/magnetic microstrip antenna |
US5797084A (en) * | 1995-06-15 | 1998-08-18 | Murata Manufacturing Co. Ltd | Radio communication equipment |
US5847682A (en) * | 1996-09-16 | 1998-12-08 | Ke; Shyh-Yeong | Top loaded triangular printed antenna |
US5859576A (en) * | 1996-03-29 | 1999-01-12 | Illinois Superconductor Corporation | Extended spring loaded tuner |
US5943016A (en) * | 1995-12-07 | 1999-08-24 | Atlantic Aerospace Electronics, Corp. | Tunable microstrip patch antenna and feed network therefor |
US5945950A (en) * | 1996-10-18 | 1999-08-31 | Arizona Board Of Regents | Stacked microstrip antenna for wireless communication |
US6046703A (en) * | 1998-11-10 | 2000-04-04 | Nutex Communication Corp. | Compact wireless transceiver board with directional printed circuit antenna |
US6061025A (en) * | 1995-12-07 | 2000-05-09 | Atlantic Aerospace Electronics Corporation | Tunable microstrip patch antenna and control system therefor |
US6091366A (en) * | 1997-07-14 | 2000-07-18 | Hitachi Cable Ltd. | Microstrip type antenna device |
US6114996A (en) * | 1997-03-31 | 2000-09-05 | Qualcomm Incorporated | Increased bandwidth patch antenna |
WO2001004992A1 (en) * | 1999-07-12 | 2001-01-18 | The United States Of America | Compact planar microstrip antenna |
US6181280B1 (en) * | 1999-07-28 | 2001-01-30 | Centurion Intl., Inc. | Single substrate wide bandwidth microstrip antenna |
US6288682B1 (en) * | 1996-03-14 | 2001-09-11 | Griffith University | Directional antenna assembly |
US6421014B1 (en) * | 1999-10-12 | 2002-07-16 | Mohamed Sanad | Compact dual narrow band microstrip antenna |
US6456249B1 (en) * | 1999-08-16 | 2002-09-24 | Tyco Electronics Logistics A.G. | Single or dual band parasitic antenna assembly |
US6473042B1 (en) * | 2001-04-11 | 2002-10-29 | Acer Neweb Corporation | Antenna for an electronic device |
US6509882B2 (en) | 1999-12-14 | 2003-01-21 | Tyco Electronics Logistics Ag | Low SAR broadband antenna assembly |
US6535108B1 (en) | 1995-08-14 | 2003-03-18 | Intermec Ip Corp. | Modulation of the resonant frequency of a circuit using an energy field |
US6583762B2 (en) * | 2001-01-11 | 2003-06-24 | The Furukawa Electric Co., Ltd. | Chip antenna and method of manufacturing the same |
US6608594B1 (en) | 1999-10-08 | 2003-08-19 | Matsushita Electric Industrial Co., Ltd. | Antenna apparatus and communication system |
US6639555B1 (en) * | 1998-07-02 | 2003-10-28 | Matsushita Electric Industrial Co., Ltd. | Antenna unit, communication system and digital television receiver |
AU767408B2 (en) * | 1999-08-02 | 2003-11-06 | Griffith University | Antennas for portable communications devices |
US6714162B1 (en) * | 2002-10-10 | 2004-03-30 | Centurion Wireless Technologies, Inc. | Narrow width dual/tri ISM band PIFA for wireless applications |
US20040075607A1 (en) * | 2000-04-26 | 2004-04-22 | Cathey David A. | Automated antenna trim for transmitting and receiving semiconductor devices |
US6741221B2 (en) * | 2001-02-15 | 2004-05-25 | Integral Technologies, Inc. | Low cost antennas using conductive plastics or conductive composites |
US20040125039A1 (en) * | 2001-04-11 | 2004-07-01 | Hideki Sasaki | Data processing terminal, terminal designing device and method, computer program, and information storing medium |
US20050040918A1 (en) * | 2001-11-12 | 2005-02-24 | Per-Simon Kildal | Strip-loaded dielectric substrates for improvements of antennas and microwave devices |
US20050128157A1 (en) * | 2003-12-13 | 2005-06-16 | Info & Communications Univ Educational Foundation | Multi-band cable antenna |
US6931233B1 (en) | 2000-08-31 | 2005-08-16 | Sirf Technology, Inc. | GPS RF front end IC with programmable frequency synthesizer for use in wireless phones |
US20050235482A1 (en) * | 2004-03-29 | 2005-10-27 | Deaett Michael A | Method for constructing antennas from textile fabrics and components |
US20060152411A1 (en) * | 2003-06-09 | 2006-07-13 | Akihiko Iguchi | Antenna and electronic equipment |
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US20060267200A1 (en) * | 2005-05-13 | 2006-11-30 | University Of Pittsburgh - Of The Commonwealth System Of Higher Education | Method of making an electronic device using an electrically conductive polymer, and associated products |
US20070007661A1 (en) * | 2005-06-09 | 2007-01-11 | Burgess Lester E | Hybrid conductive coating method for electrical bridging connection of RFID die chip to composite antenna |
US20070012773A1 (en) * | 2005-06-07 | 2007-01-18 | University Of Pittsburgh - Of The Commonwealth System Of Higher Education | Method of making an electronic device using an electrically conductive polymer, and associated products |
US20070029385A1 (en) * | 2005-08-05 | 2007-02-08 | Kovac F G | Multi-planar radio frequency identification device |
US20070075837A1 (en) * | 1996-07-30 | 2007-04-05 | Tuttle Mark E | Radio frequency data communications device with selectively removable antenna portion and method |
US20070229377A1 (en) * | 2005-11-25 | 2007-10-04 | Mccarrick Charles D | Low profile msat skewed beam antenna methods and systems |
US20090278746A1 (en) * | 2008-05-07 | 2009-11-12 | Nokia Siemens Networks Oy | Wideband or multiband various polarized antenna |
US20110037675A1 (en) * | 2009-08-14 | 2011-02-17 | National Chiao Tung University | Coplanar antenna unit and coplanar antenna |
US20110151805A1 (en) * | 2009-12-21 | 2011-06-23 | Kabushiki Kaisha Toshiba | Coupler and wireless communication device using coupler |
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Cited By (80)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US5657028A (en) * | 1995-03-31 | 1997-08-12 | Nokia Moblie Phones Ltd. | Small double C-patch antenna contained in a standard PC card |
US5781158A (en) * | 1995-04-25 | 1998-07-14 | Young Hoek Ko | Electric/magnetic microstrip antenna |
US5627550A (en) * | 1995-06-15 | 1997-05-06 | Nokia Mobile Phones Ltd. | Wideband double C-patch antenna including gap-coupled parasitic elements |
US5797084A (en) * | 1995-06-15 | 1998-08-18 | Murata Manufacturing Co. Ltd | Radio communication equipment |
US6535108B1 (en) | 1995-08-14 | 2003-03-18 | Intermec Ip Corp. | Modulation of the resonant frequency of a circuit using an energy field |
US5943016A (en) * | 1995-12-07 | 1999-08-24 | Atlantic Aerospace Electronics, Corp. | Tunable microstrip patch antenna and feed network therefor |
US5777581A (en) * | 1995-12-07 | 1998-07-07 | Atlantic Aerospace Electronics Corporation | Tunable microstrip patch antennas |
US6061025A (en) * | 1995-12-07 | 2000-05-09 | Atlantic Aerospace Electronics Corporation | Tunable microstrip patch antenna and control system therefor |
US5680144A (en) * | 1996-03-13 | 1997-10-21 | Nokia Mobile Phones Limited | Wideband, stacked double C-patch antenna having gap-coupled parasitic elements |
US6288682B1 (en) * | 1996-03-14 | 2001-09-11 | Griffith University | Directional antenna assembly |
US5859576A (en) * | 1996-03-29 | 1999-01-12 | Illinois Superconductor Corporation | Extended spring loaded tuner |
US5703600A (en) * | 1996-05-08 | 1997-12-30 | Motorola, Inc. | Microstrip antenna with a parasitically coupled ground plane |
DE19720773A1 (en) * | 1996-06-03 | 1998-02-05 | Mitsubishi Electric Corp | Antenna device |
DE19720773B4 (en) * | 1996-06-03 | 2012-05-31 | Mitsubishi Denki K.K. | Double resonance frequency antenna device |
US20070075837A1 (en) * | 1996-07-30 | 2007-04-05 | Tuttle Mark E | Radio frequency data communications device with selectively removable antenna portion and method |
US7884724B2 (en) | 1996-07-30 | 2011-02-08 | Round Rock Research, Llc | Radio frequency data communications device with selectively removable antenna portion and method |
US20080100422A1 (en) * | 1996-07-30 | 2008-05-01 | Tuttle Mark E | Radio Frequency Identification Device Operating Methods, Radio Frequency Identification Device Configuration Methods, and Radio Frequency Identification Devices |
US8624711B2 (en) | 1996-07-30 | 2014-01-07 | Round Rock Research, Llc | Radio frequency identification device operating methods, radio frequency identification device configuration methods, and radio frequency identification devices |
US5847682A (en) * | 1996-09-16 | 1998-12-08 | Ke; Shyh-Yeong | Top loaded triangular printed antenna |
US5945950A (en) * | 1996-10-18 | 1999-08-31 | Arizona Board Of Regents | Stacked microstrip antenna for wireless communication |
US6114996A (en) * | 1997-03-31 | 2000-09-05 | Qualcomm Incorporated | Increased bandwidth patch antenna |
US6091366A (en) * | 1997-07-14 | 2000-07-18 | Hitachi Cable Ltd. | Microstrip type antenna device |
US6639555B1 (en) * | 1998-07-02 | 2003-10-28 | Matsushita Electric Industrial Co., Ltd. | Antenna unit, communication system and digital television receiver |
US6046703A (en) * | 1998-11-10 | 2000-04-04 | Nutex Communication Corp. | Compact wireless transceiver board with directional printed circuit antenna |
WO2001004992A1 (en) * | 1999-07-12 | 2001-01-18 | The United States Of America | Compact planar microstrip antenna |
US6181280B1 (en) * | 1999-07-28 | 2001-01-30 | Centurion Intl., Inc. | Single substrate wide bandwidth microstrip antenna |
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Also Published As
Publication number | Publication date |
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DE69411355D1 (en) | 1998-08-06 |
EP0655797A1 (en) | 1995-05-31 |
EP0655797B1 (en) | 1998-07-01 |
DE69411355T2 (en) | 1999-03-04 |
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